Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 182, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2019.107720
Keywords
Carbon aerogel composites; Mechanical properties; Fractography
Categories
Funding
- Defence Science and Technology Laboratory [MAST 2.2.2]
- EPSRC [EP/I02946X/1]
- University of Bristol [EP/P007465/1]
- EU Horizon 2020 Programme, Clean Sky 2 Funding Scheme (CS2-RIA - Research and Innovation action) [H2020-EU.3.4.5.1, 738085]
- EPSRC [EP/P007465/1, EP/I02946X/1] Funding Source: UKRI
- H2020 Societal Challenges Programme [738085] Funding Source: H2020 Societal Challenges Programme
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Carbon aerogel (CAG) is a potential hierarchical reinforcement to improve the matrix-dominated mechanical properties of continuous carbon fibre reinforced polymer (CFRP) composites in both multifunctional and purely structural applications. When using CAG to reinforce a polyethylene glycol diglycidyl ether (PEGDGE) matrix, the interlaminar shear strength, compressive modulus and strength increased approximately four-fold, whilst the out-of-plane electrical conductivity increased by 118%. These mechanical and electrical performance enhancements significantly improve the multifunctional efficiency of composite structural supercapacitors, which can offer weight savings in transport and other applications. However, CAG also has the potential to reinforce conventional continuous CF composites in purely structural contexts. Here, CAG reinforcement of structural epoxy resin composites marginally increased compressive (1.4%) and tensile (2.7%) moduli respectively, but considerably reduced compressive, tensile and interlaminar shear strengths. Fractographic analysis shows that the reduced performance can be attributed to poor interfacial adhesion; in the future, alternative processing routes may resolve these issues to achieve advances in both moduli and strengths over conventional structural CFRPs.
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